libphonenumber\PhoneNumberDesc::setNationalNumberPattern PHP Method

    public function setNationalNumberPattern($value)
    {
        $this->hasNationalNumberPattern = true;
        $this->nationalNumberPattern = $value;
        return $this;
    }

 public function testMaybeStripNationalPrefix()
 {
     $metadata = new PhoneMetadata();
     $metadata->setNationalPrefixForParsing("34");
     $phoneNumberDesc = new PhoneNumberDesc();
     $phoneNumberDesc->setNationalNumberPattern("\\d{4,8}");
     $metadata->setGeneralDesc($phoneNumberDesc);
     $numberToStrip = "34356778";
     $strippedNumber = "356778";
     $carrierCode = null;
     $this->assertTrue($this->phoneUtil->maybeStripNationalPrefixAndCarrierCode($numberToStrip, $metadata, $carrierCode));
     $this->assertEquals($strippedNumber, $numberToStrip, "Should have had national prefix stripped.");
     // Retry stripping - now the number should not start with the national prefix, so no more
     // stripping should occur.
     $carrierCode = null;
     $this->assertFalse($this->phoneUtil->maybeStripNationalPrefixAndCarrierCode($numberToStrip, $metadata, $carrierCode));
     $this->assertEquals($strippedNumber, $numberToStrip, "Should have had no change - no national prefix present.");
     // Some countries have no national prefix. Repeat test with none specified.
     $metadata->setNationalPrefixForParsing("");
     $carrierCode = null;
     $this->assertFalse($this->phoneUtil->maybeStripNationalPrefixAndCarrierCode($numberToStrip, $metadata, $carrierCode));
     $this->assertEquals($strippedNumber, $numberToStrip, "Should not strip anything with empty national prefix.");
     // If the resultant number doesn't match the national rule, it shouldn't be stripped.
     $metadata->setNationalPrefixForParsing("3");
     $numberToStrip = "3123";
     $strippedNumber = "3123";
     $carrierCode = null;
     $this->assertFalse($this->phoneUtil->maybeStripNationalPrefixAndCarrierCode($numberToStrip, $metadata, $carrierCode));
     $this->assertEquals($strippedNumber, $numberToStrip, "Should have had no change - after stripping, it wouldn't have matched the national rule.");
     // Test extracting carrier selection code.
     $metadata->setNationalPrefixForParsing("0(81)?");
     $numberToStrip = "08122123456";
     $strippedNumber = "22123456";
     $carrierCode = "";
     $this->assertTrue($this->phoneUtil->maybeStripNationalPrefixAndCarrierCode($numberToStrip, $metadata, $carrierCode));
     $this->assertEquals("81", $carrierCode);
     $this->assertEquals($strippedNumber, $numberToStrip, "Should have had national prefix and carrier code stripped.");
     // If there was a transform rule, check it was applied.
     $metadata->setNationalPrefixTransformRule("5\${1}5");
     // Note that a capturing group is present here.
     $metadata->setNationalPrefixForParsing("0(\\d{2})");
     $numberToStrip = "031123";
     $transformedNumber = "5315123";
     $carrierCode = null;
     $this->assertTrue($this->phoneUtil->maybeStripNationalPrefixAndCarrierCode($numberToStrip, $metadata, $carrierCode));
     $this->assertEquals($transformedNumber, $numberToStrip, "Should transform the 031 to a 5315.");
 }